I must admit. This surprised me. Is Eddie the best available? I wish him all the best, but he seems like a weak link on that roster.

Well, he is one of only five Swedish goalies to have played 20+ games in the NHL this season.
Of the other four, Henrik Lundquist is otherwise occupied, Jacob Markström is injured and Robin Lehner and Anders Nilsson are between contracts. Lehner has said though, that if he and the Sabres have come to terms before the World Championship starts, he'd be happy to play.

Victor Fasth has started the two first games for Sweden, and thus seems to be the coaches's choice for #1.
He wasn't all that successful in the NHL, but has played 30 games for the Ducks and 33 for the Oilers over four seasons. He is now the second stringer for CSKA Moskva in the KHL and has posted pretty good stats there, a 1.61 GAA and .921 saves average in 15/16 followed by 1.69 and .929 in 16/17. It's his fourth world championship, and combined with having played in both the NHL and the KHL he has ample international experience. He was also named best goalie in the SHL twice (10/11 and 11/12) before heading to Anaheim.

Which brings us back to Läck. I read a column by a Swedish journalist who covers the NHL, who states that Eddie is a great guy to have in the locker room. A positive and friendly guy who is well liked by everyone. This in combination with being a decent enough goalie could probably make him the ideal backup.

Nylander looked really good in Sweden's 7-2 game against Germany.
First a brilliant play and pass to Brodin for the 4-2 goal, then roofing the puck on a breakaway for 6-2 and finally gong into traffic in front of Germany's goal ans just forcing the puck in.
A few years down the line this kid could become a really good player.